The limit surface of a mesh is computed by a SurfaceSmoother plug-in. Mudbox uses this object to obtain information about the limit surface without actually calculating additional subdivision levels for the meshes. This limit surface is used during texture extraction.

If you need to control the algorithm by which this limit surface is calculated, you can override this class in a plug-in, and replace Mudbox's version, which is in the plug-in called CCSurfaceSmoother. To create your own:

1. Write a plug-in that defines your own class derived from SurfaceSmoother.
2. Delete the existing CCSurfaceSmoother plug-in, and copy yours into the plug-in folder. On OSX, this plug-in is found in the Mudbox package, under Contents > MacOS > plugins. On the PC, it is found in under work\plugins.